The remarkably complete fossil skeleton that paleontologists analysed indicates that this was likely a semi-aquatic dinosaur, able to both swim and to move about on land.

“This is the first dinosaur with a lifestyle similar to aquatic birds: this indicates that these dinosaurs were able to exploit an environment that was not considered in our previous interpretation of dinosaur history,” Andrea Cau, a paleontologist at the Giovanni Capellini Geological Museum of the University of Bologna and lead author of the paper, said in an email.

(Lukas Panzarin)

This finding helps establish a new subfamily of similar dinosaurs, according to the paper. Several other fossil specimens from the same region fit into this family, indicating they’re part of the same small branch on the evolutionary tree.

The discovery “illustrates how much of the diversity of Dinosauria remains undiscovered, even in intensely studied regions such as Mongolia,” the authors wrote in the paper.

For this discovery, researchers used a scanning method that Cau described as “the most advanced scanning technology ever done on a fossil” to collect about 6,000 GB of data on the fossil while it was still partially embedded in rock.

The dinosaur dates back between 71 and 75 million years.

It’s hard to prove this was definitely a semi-aquatic creature, but the specimen has a number of features that match those of semi- and fully aquatic reptiles and birds.

It had arms with structures similar to those that aquatic birds like penguins use to swim. And it had a neck like a goose with rows of teeth inside its mouth.

But instead of webbed feet, it had claws and toes like those of theropod family, which includes velociraptors and Tyrannosaurus Rex.

The dinosaur likely fed on fish, crustaceans, and small reptiles and mammals, according to Cau. The other members of this subfamily would have been a similar size.

The finding shows that there’s still plenty of new history to be revealed as paleontologists scour the Earth for remains of the past.

All articles, images, product names, logos, and brands are property of their respective owners.
All company, product and service names used in this website are for identification purposes only.
Use of these names, logos, and brands does not imply endorsement. By using this site, you agree to the Terms of Use
and Privacy Policy.